HW # 34- Writing in Science (type if you can) Due Tuesday

Warm up

Name as many parts of the eye as you can.-

Week 9, Day Three

Warm up Response

W

Homework Response/CheckRead your neighbor’s “CYFTD” lab conclusion.

Give them some feedback (2 warm and 1 cool).

•Eyes

The Human Eye!

Window to the world!

7 main parts of the eye

Cornea

Iris

Pupil

Lens

Sclera

Retina

Optic Nerve

Pupil

Lens

Iris

Cornea

Retina

Optic Nerve

Sclera

FYI:Look closely at the eye:

Sclera

White of the eye

Covers whole outside of eye

Tough protective outer layer

Cornea

ClearCovers irisAllows light to enterProtectsFocuses Image to help make image clear (ex: coarse adjustment knob)This is where sclera becomes a clear window for the eye

Iris

Colored part of eye

Muscles open and close pupil

Lighter colored iris lets in more light

Darker colors protect more, less light enters eye

Pupil

Hole in center of iris

Lets light waves into eye

Adjusts in size to light levels

Light entering shines on retina

Lens

Behind iris/pupil

Focuses light waves (ex: fine adjustment knob)

Makes images clear

(See next slide for clear picture of lens)

Check out the eye

Vitreous Humor

Jelly-like fluid that fills most of the eye (from the lens back)

Helps the eye hold it’s sphere shape

Retina

Back of the eye where light shinesLike a movie screenShows us what we see by sending information to the optic nerve.

An Actual Retina!!!

2 kinds of cells in the retina:Cones--see color

Rods--see form and shape

Tapetum Lucidum

Shiny blue-green color

Reflects lights to allow more light to the retina

Allows for better vision in dark environments

Optic Nerve

Sends information from the eye to the brain

Thick cord at lower back of eye

Diagram of the eye:Very dry…

Can you identify the structures now???

Facts! Eyes…..

-Are the most complex organs in the body second to the brain.

-Contribute to 80% of your total knowledge

-Are composed of more than 2 million working parts

-During a normal life will bring in 24 million images of the world around you

-The adult eye measures about one inch in diameter (2.5 cm), but only one sixth of the

area is exposed on the front.